10_1425_web_Lec_14_MoreEnergyTopics

10_1425_web_Lec_14_MoreEnergyTopics - More Energy Topics...

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More Energy Topics Physics 1425 Lecture 14 Michael Fowler, UVa
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Topics for Today Overall Energy Conservation Gravitation and Escape Velocity Power Equilibrium
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Overall Energy Conservation In the real world, there’s lots of friction, air resistance, etc., so even for a well-designed roller coaster, mgh + ½ mv 2 gradually goes down. Experimentally, loss of mechanical energy is invariably accompanied by the production of heat: and the amount of heat produced, properly measured, equals the mechanical energy lost.
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Heat is K.E. and P.E. of molecules Mechanical energy lost to air resistance almost all goes to speed up the air molecules. Friction transfers energy mainly to microscopic vibrations of the surface: think of the atoms and molecules as balls held together with springs (the bonds), the balls will gain kinetic energy, the springs potential energy. These molecular energies are random and disorganized —not so easy to utilize as macroscopic energy.
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Clicker Question Just FYI – not for credit!
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This note was uploaded on 12/07/2011 for the course PHYSICS 1425 taught by Professor Michaelfowler during the Spring '10 term at UVA.

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10_1425_web_Lec_14_MoreEnergyTopics - More Energy Topics...

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